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NLC 2009-06-18/19

BAA report

The report to the BAA Aurora Section gives an overview of the night, which times were cloudy, free of NLC, or with sightings of NLC.

Name of observer: Horst Meyerdierks
Location: Royal Observatory Edinburgh, 55.9N 3.2W
          unattended dSLR with limited field of view A ~325-35, h ~0-40
          images every 5 min
Date: 2009-06-18/19

  UT   forms  bright   height   azimuth   comments
               ness   top bot  left rght  e.g. weather
-----  -----  ------  -------  ---- ----  --------------------------------
21:40  X                                  cloud to h 5
21:45  X                                  cloud to h 5
21:50  X                                  no image
21:55  X                                  no image
22:00  X                                  cloud
22:05  X                                  cloud
22:10  NLC     1       25  15   340 >350  cloud to h 5 and on right
22:15  II      2       25  15   330  360  cloud to h 5
22:20  II      2       30  15   325  360  cloud to h 5
22:25  II      2       30  15   325  360  cloud to h 5, to h 15 on left
22:30  II      2       30  15   325  360  cloud to h 10, patches to h 15
22:35  II      2       30  15   325  360  cloud to h 15
22:40  II      2       40      <325  360  cloud to h 15
22:45  II      2                          patchy cloud
22:50  II      2                          patchy cloud
22:55  II      2                          patchy cloud
23:00  II      2                          patchy cloud
23:05  II      2       30   5  <325    5  cloud to h 5, patches higher
23:10  I,II    2       30   5  <325   15  cloud to h 10
23:15  II      2       20   5  <325   20  cloud to h 5
23:20  II,III  2       20   5  <325   20  cloud to h 5
23:25  II,III  2       20   5  <325   20  cloud to h 5
23:30  II,III  3       20  <5  <325   25  cloud to h 5
23:35  II,III  2       15  <5  <325   25  cloud to h 5
23:40  II,III  3       15  <5  <325   30  cloud to h 5
23:45  II,III  3       15  <5  <325   30  cloud to h 5
23:50  II      4       10  <5  <325   30  cloud to h 5
23:55  II      4       10  <5  <325   30  cloud to h 5
00:00  IV      4                          cloud to h 5
00:05  IV                                 patchy cloud to h 15
00:10  IV      4                          patchy cloud to h 15
00:15  IV      4       10      <325  >30  patchy cloud to h 10
00:20  IV      4       10      <325  >30  patchy cloud to h 10
00:25  IV      4       10      <325  >30  patchy cloud to h 10
00:30  II,IV   4       15      <325  >30  patchy cloud to h 10
00:35  II,IV   4       15      <325  >30  patchy cloud to h 10
00:40  II,IV   4       15      <325  >35  patchy cloud to h 10
00:45  II,IV   4       15      <325  >35  patchy cloud to h 10
00:50  II,IV   4       15      <325  >35  patchy cloud to h 10
00:55  II,IV   4       15      <325  >35  patchy cloud to h 15
01:00  NLC     4                          patchy cloud
01:05  NLC                                patchy cloud
01:10  NLC                                patchy cloud
01:15  NLC     4                          patchy cloud
01:20  NLC                                patchy cloud
01:25  NLC                                patchy cloud
01:30  NLC                                patchy cloud
01:35  NLC                                patchy cloud
01:40  NLC                                patchy cloud
01:45  NLC                                patchy cloud
01:50  X                                  cloud
01:55  X                                  cloud
02:00  X                                  cloud
02:05  NLC?                               patchy cloud
02:10  X                                  cloud
02:15  X                                  cloud
02:20  X                                  cloud
02:25  X                                  cloud
02:30  X                                  cloud
02:35  X                                  cloud
02:40  X                                  cloud
02:45  X                                  cloud
02:50  X                                  cloud

forms: I: veil
       II: bands
       III: waves
       IV: whirls
       NLC: other than or multiple of I-IV
       0: no NLC
       X: no decision possible (mist, cloud etc.)
brightness: 1: very weak
            2: clearly detected
            3: clearly visible
            4: very bright
            5: extremely bright

NLCnet report

The periods of positive sightings of NLC are reported to the NLC Observers' Home Page:

Name: Horst Meyerdierks
Country: Scotland
Location: Edinburgh
Date: 2009/06/18-19
Start: 22:10
End: 01:45
Forms: I, II, III, IV
Max elevation: 40
Max brightness: 4
Comments:
<a href="http://www.chiandh.me.uk/p/NLC_2009-06-18/19>Images</a>.

forms: I: veil
       II: bands
       III: waves
       IV: whirls
       O: other than or multiple of I-IV
brightness: 1: very weak
            2: clearly detected
            3: clearly visible
            4: very bright
            5: extremely bright

Images

Listed below are the images with positive sightings of NLC. These have been processed merely to adjust the brightness for underexposure. For some, there may also be an unsharp-masked version of the image.

  UT    exp    A    hSun  h15   h85  stretch  image      (masked)
----- ------ ----- ----- ----- -----  ----- ---------------------
22:10  0.400 331.6  -6.4   1.5 166.2  0-255 q2719.jpg m2719.jpg
22:15  0.600 332.7  -6.7   1.0 164.0  0-255 q2720.jpg m2720.jpg
22:20  0.800 333.8  -7.0   0.6 161.3  0-255 q2721.jpg m2721.jpg
22:25  1.000 334.9  -7.3   0.3 158.0  0-255 q2722.jpg
22:30  1.300 336.1  -7.6   0.0 153.8  0-255 q2723.jpg
22:35  1.300 337.2  -7.9  -0.3 148.3  0-200 q2724.jpg
22:40  2.000 338.3  -8.2  -0.5 140.9  0-200 q2725.jpg
22:45  2.500 339.4  -8.4  -0.7 131.1  0-255 q2726.jpg
22:50  2.500 340.6  -8.7  -0.9 118.1  0-255 q2727.jpg
22:55  3.200 341.7  -8.9  -1.1 102.1  0-255 q2728.jpg
23:00  4.000 342.8  -9.1  -1.3  85.2  0-255 q2730.jpg
23:05  5.000 344.0  -9.3  -1.4  70.0  0-255 q2732.jpg
23:10  6.000 345.1  -9.5  -1.6  57.9  0-255 q2735.jpg m2735.jpg
23:15  6.000 346.3  -9.7  -1.7  48.9  0-255 q2738.jpg
23:20  8.000 347.4  -9.8  -1.8  42.3  0-255 q2741.jpg
23:25  8.000 348.6 -10.0  -1.9  37.4  0-255 q2744.jpg
23:30  8.000 349.8 -10.1  -2.0  33.7  0-255 q2748.jpg
23:35  8.000 350.9 -10.2  -2.1  30.9  0-255 q2752.jpg
23:40  8.000 352.1 -10.3  -2.1  28.7  0-255 q2756.jpg
23:45  8.000 353.2 -10.4  -2.2  27.1  0-255 q2760.jpg
23:50  4.000 354.4 -10.5  -2.2  25.8  0-200 q2765.jpg
23:55  4.000 355.6 -10.6  -2.3  24.8  0-200 q2769.jpg
00:00  8.000 356.7 -10.6  -2.3  24.1  0-255 q2772.jpg
00:05  8.000 357.9 -10.6  -2.3  23.6  0-255 q2776.jpg
00:10  4.000 359.1 -10.7  -2.3  23.4  0-255 q2781.jpg
00:15  4.000   0.2 -10.7  -2.4  23.3  0-255 q2785.jpg
00:20  4.000   1.4 -10.6  -2.3  23.5  0-255 q2789.jpg
00:25  4.000   2.6 -10.6  -2.3  23.8  0-255 q2793.jpg
00:30  4.000   3.7 -10.6  -2.3  24.4  0-255 q2797.jpg
00:35  4.000   4.9 -10.5  -2.3  25.2  0-255 q2801.jpg
00:40  4.000   6.1 -10.5  -2.2  26.2  0-255 q2805.jpg
00:45  4.000   7.2 -10.4  -2.2  27.7  0-255 q2809.jpg
00:50  4.000   8.4 -10.3  -2.1  29.6  0-255 q2813.jpg
00:55  4.000   9.5 -10.2  -2.0  32.0  0-255 q2817.jpg
01:00  4.000  10.7 -10.1  -1.9  35.1  0-255 q2820.jpg
01:05  4.000  11.9  -9.9  -1.9  39.2  0-255 q2823.jpg
01:10  4.000  13.0  -9.8  -1.7  44.8  0-255 q2826.jpg
01:15  4.000  14.2  -9.6  -1.6  52.2  0-255 q2829.jpg
01:20  4.000  15.3  -9.4  -1.5  62.4  0-255 q2832.jpg
01:25  2.000  16.5  -9.2  -1.4  75.8  0-200 q2836.jpg
01:30  2.000  17.6  -9.0  -1.2  91.9  0-200 q2838.jpg
01:35  2.000  18.7  -8.8  -1.0 108.8  0-255 q2840.jpg
01:40  2.500  19.9  -8.6  -0.8 123.7  0-255 q2841.jpg
01:45  2.000  21.0  -8.3  -0.6 135.4  0-255 q2842.jpg
02:05  0.800  25.5  -7.2   0.4 159.4  0-255 q2846.jpg

exp: Exposure time in seconds (200 ISO, f/3.5).
A: Azimuth of the Sun (degrees).
hSun: Altitude of the Sun (degrees, negative below horizon).
h15: Max. altitude of sunlight at 15 km height (degrees).
h85: Max. altitude of sunlight at 85 km height (degrees).
stretch: Contrast stretch (0-255 means no stretch).